Electromotor dynamic/stable stage parameter identification method based on stator resistance observer

A stator resistance and motor technology, applied in electronic commutation motor control, motor generator control, control generator and other directions, can solve the problems of voltage model error, reduced estimation accuracy, rotor speed and rotor resistance identification difficulties, etc.

CN102624320AInactive Publication Date: 2012-08-01CHONGQING JIAOTONG UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-08-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an electromotor dynamic / stable stage parameter identification method based on a stator resistance observer. For the parameter identification at a dynamic stage of an electromotor, a stator resistance T-S (Takagi-Sugeno) fuzzy observer is introduced to obtain an actually-measured value of stator resistance on the basis that the existing MRAS (Model Reference Adaptive System) method is still adopted, and dynamic correction is carried out on a rotating speed reference model and a resistance reference model according to the actually-measured value of the stator resistance; and for the parameter identification at a stable stage, the identification method for the rotating speed of a rotor is achieved by adopting the MRAS method and the stator resistance T-S fuzzy observer which are the same as those adopted in the parameter identification at the dynamic stage, and the identification method for the resistance of the rotor is achieved by adopting simple conversion. The electromotor dynamic / stable stage parameter identification method based on the stator resistance observer has the beneficial technical effects that the problem of inaccurate reference models is solved, the low-speed operating performance of the electromotor can be improved, the adoption of a current injection method is avoided, the current injection equipment is saved, the complexity of a system is lowered, the introduction of torque ripple is avoided, and the like.
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Description

technical field

[0001] The invention relates to an on-line identification technology of induction motor parameters without a speed sensor, in particular to an identification method of electric motor dynamic / steady state phase parameters based on a stator resistance observer. Background technique

[0002] In sensorless vector control systems of induction motors, the model reference adaptive method (also called MRAS method) is widely used in sensorless AC speed control systems due to its simple principle, easy implementation and good stability.

[0003] In the sensorless vector control system based on MRAS method, the identification of motor parameters can be divided into two parts: dynamic phase and steady state phase. Many methods for estimating motor parameters online explicitly or implicitly require the motor to be in a dynamic process. In actual operation, the motor flux is usually in a steady state for a long time, and it is difficult to obtain the motor parameters in t...

Examples

Embodiment

[0155] In order to verify the effect brought by the present invention, the motors using the existing method and the method of the present invention were compared experimentally at different given rotational speed values. The experiments were performed at a load of 12 N . m (approximately 85.7% of the rated value), the speed setting is low speed, that is, it is carried out under the condition that the speed setting changes suddenly between 80~30rpm / min. The parameters of the induction motor used in the experiment are as follows: rated power , rated voltage , rated current ,Rated speed , stator resistance , rotor resistance , stator inductance , rotor inductance , mutual inductance , rated torque ,Number of pole pairs ,Moment of inertia .

[0156] attached Figure 13 is the motor speed value obtained according to the existing identification method, the dotted line in the figure is the given speed value, and the solid line is the actual speed value. Whe...